His comments provoked a joint statement in support of the five-day gay pride festival from the ambassadors of 13 Western nations, including the UK and US.

But their letter drew an angry response from Czech President Vaclav Klaus, who refused to distance himself from Mr Hajek. The deputy chancellor had previously drawn criticism for rejecting Darwinism and calling the dead al-Qaeda leader Osama bin Laden a "media fiction".

Vltava converts

As Saturday's march went ahead in light drizzle, riot police held back dozens of far-right extremists who had gathered to shout abusive slogans.

The Czech Republic's Conservative Christian Democrats also held a peaceful counter-parade in support of traditional family values.

But the abuse and moist conditions did not dampen the party atmosphere, as marchers danced to music played from loudspeakers mounted on vans.

The march was to culminate in a series of concerts on an island in the Vltava river, as part of a five-day festival comprising some 80 events - concerts, films, seminars, exhibitions and parties - in 30 venues around the capital.

A gay pride march in the Czech Republic's second city Brno in 2008 ended in clashes.